Popular with many Chinese men who believe drinking the wine will enhance their sex drive and make them stronger, the bones are soaked for up to eight years and then mixed with snake extract and herbs.
Although breeding them for their body parts is illegal, there are an estimated 6,000 tigers in captivity in China, which is more than double the amount of wild tigers in the world.
The tigers in captivity are reportedly emaciated and overcrowded. In the Xiongsen Bear and Tiger Mountain park, there are more than 1,800 tigers, and a further 1,000 live in the Siberian Tiger Park in northern China.
The farms are open to the public as tourist attractions. At Xiongsen, there is a circus performance held each day, where tigers do tricks.
What they don't show the children is what happens when the tigers at Xiongsen die, because they are taken to a factory where their bones are soaked in vats of tiger wine for eight years.